1 /* $NetBSD: if_ppp.c,v 1.141 2013/09/18 23:34:55 rmind Exp $ */ 2 /* Id: if_ppp.c,v 1.6 1997/03/04 03:33:00 paulus Exp */ 3 4 /* 5 * if_ppp.c - Point-to-Point Protocol (PPP) Asynchronous driver. 6 * 7 * Copyright (c) 1984-2000 Carnegie Mellon University. All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 21 * 3. The name "Carnegie Mellon University" must not be used to 22 * endorse or promote products derived from this software without 23 * prior written permission. For permission or any legal 24 * details, please contact 25 * Office of Technology Transfer 26 * Carnegie Mellon University 27 * 5000 Forbes Avenue 28 * Pittsburgh, PA 15213-3890 29 * (412) 268-4387, fax: (412) 268-7395 30 * tech-transfer@andrew.cmu.edu 31 * 32 * 4. Redistributions of any form whatsoever must retain the following 33 * acknowledgment: 34 * "This product includes software developed by Computing Services 35 * at Carnegie Mellon University (http://www.cmu.edu/computing/)." 36 * 37 * CARNEGIE MELLON UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO 38 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY 39 * AND FITNESS, IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY BE LIABLE 40 * FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 41 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 42 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING 43 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 44 * 45 * Based on: 46 * @(#)if_sl.c 7.6.1.2 (Berkeley) 2/15/89 47 * 48 * Copyright (c) 1987 Regents of the University of California. 49 * All rights reserved. 50 * 51 * Redistribution and use in source and binary forms are permitted 52 * provided that the above copyright notice and this paragraph are 53 * duplicated in all such forms and that any documentation, 54 * advertising materials, and other materials related to such 55 * distribution and use acknowledge that the software was developed 56 * by the University of California, Berkeley. The name of the 57 * University may not be used to endorse or promote products derived 58 * from this software without specific prior written permission. 59 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 60 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 61 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 62 * 63 * Serial Line interface 64 * 65 * Rick Adams 66 * Center for Seismic Studies 67 * 1300 N 17th Street, Suite 1450 68 * Arlington, Virginia 22209 69 * (703)276-7900 70 * rick@seismo.ARPA 71 * seismo!rick 72 * 73 * Pounded on heavily by Chris Torek (chris@mimsy.umd.edu, umcp-cs!chris). 74 * Converted to 4.3BSD Beta by Chris Torek. 75 * Other changes made at Berkeley, based in part on code by Kirk Smith. 76 * 77 * Converted to 4.3BSD+ 386BSD by Brad Parker (brad@cayman.com) 78 * Added VJ tcp header compression; more unified ioctls 79 * 80 * Extensively modified by Paul Mackerras (paulus@cs.anu.edu.au). 81 * Cleaned up a lot of the mbuf-related code to fix bugs that 82 * caused system crashes and packet corruption. Changed pppstart 83 * so that it doesn't just give up with a collision if the whole 84 * packet doesn't fit in the output ring buffer. 85 * 86 * Added priority queueing for interactive IP packets, following 87 * the model of if_sl.c, plus hooks for bpf. 88 * Paul Mackerras (paulus@cs.anu.edu.au). 89 */ 90 91 /* from if_sl.c,v 1.11 84/10/04 12:54:47 rick Exp */ 92 /* from NetBSD: if_ppp.c,v 1.15.2.2 1994/07/28 05:17:58 cgd Exp */ 93 94 /* 95 * XXX IMP ME HARDER 96 * 97 * This is an explanation of that comment. This code used to use 98 * splimp() to block both network and tty interrupts. However, 99 * that call is deprecated. So, we have replaced the uses of 100 * splimp() with splhigh() in order to applomplish what it needs 101 * to accomplish, and added that happy little comment. 102 */ 103 104 #include <sys/cdefs.h> 105 __KERNEL_RCSID(0, "$NetBSD: if_ppp.c,v 1.141 2013/09/18 23:34:55 rmind Exp $"); 106 107 #include "ppp.h" 108 109 #include "opt_inet.h" 110 #include "opt_gateway.h" 111 #include "opt_ppp.h" 112 113 #ifdef INET 114 #define VJC 115 #endif 116 #define PPP_COMPRESS 117 118 #include <sys/param.h> 119 #include <sys/proc.h> 120 #include <sys/mbuf.h> 121 #include <sys/socket.h> 122 #include <sys/ioctl.h> 123 #include <sys/kernel.h> 124 #include <sys/systm.h> 125 #include <sys/time.h> 126 #include <sys/malloc.h> 127 #include <sys/module.h> 128 #include <sys/mutex.h> 129 #include <sys/once.h> 130 #include <sys/conf.h> 131 #include <sys/kauth.h> 132 #include <sys/intr.h> 133 #include <sys/socketvar.h> 134 135 #include <net/if.h> 136 #include <net/if_types.h> 137 #include <net/netisr.h> 138 #include <net/route.h> 139 #ifdef PPP_FILTER 140 #include <net/bpf.h> 141 #endif 142 143 #include <netinet/in.h> 144 #include <netinet/in_systm.h> 145 #include <netinet/in_var.h> 146 #ifdef INET 147 #include <netinet/ip.h> 148 #endif 149 150 #include <net/bpf.h> 151 152 #include <net/slip.h> 153 154 #ifdef VJC 155 #include <net/slcompress.h> 156 #endif 157 158 #include <net/ppp_defs.h> 159 #include <net/if_ppp.h> 160 #include <net/if_pppvar.h> 161 #include <sys/cpu.h> 162 163 #ifdef PPP_COMPRESS 164 #define PACKETPTR struct mbuf * 165 #include <net/ppp-comp.h> 166 #endif 167 168 static int pppsioctl(struct ifnet *, u_long, void *); 169 static void ppp_requeue(struct ppp_softc *); 170 static void ppp_ccp(struct ppp_softc *, struct mbuf *m, int rcvd); 171 static void ppp_ccp_closed(struct ppp_softc *); 172 static void ppp_inproc(struct ppp_softc *, struct mbuf *); 173 static void pppdumpm(struct mbuf *m0); 174 #ifdef ALTQ 175 static void ppp_ifstart(struct ifnet *ifp); 176 #endif 177 178 static void pppintr(void *); 179 180 /* 181 * Some useful mbuf macros not in mbuf.h. 182 */ 183 #define M_IS_CLUSTER(m) ((m)->m_flags & M_EXT) 184 185 #define M_DATASTART(m) \ 186 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_buf : \ 187 (m)->m_flags & M_PKTHDR ? (m)->m_pktdat : (m)->m_dat) 188 189 #define M_DATASIZE(m) \ 190 (M_IS_CLUSTER(m) ? (m)->m_ext.ext_size : \ 191 (m)->m_flags & M_PKTHDR ? MHLEN: MLEN) 192 193 /* 194 * We define two link layer specific mbuf flags, to mark high-priority 195 * packets for output, and received packets following lost/corrupted 196 * packets. 197 */ 198 #define M_HIGHPRI M_LINK0 /* output packet for sc_fastq */ 199 #define M_ERRMARK M_LINK1 /* rx packet following lost/corrupted pkt */ 200 201 static int ppp_clone_create(struct if_clone *, int); 202 static int ppp_clone_destroy(struct ifnet *); 203 204 static struct ppp_softc *ppp_create(const char *, int); 205 206 static LIST_HEAD(, ppp_softc) ppp_softc_list; 207 static kmutex_t ppp_list_lock; 208 209 struct if_clone ppp_cloner = 210 IF_CLONE_INITIALIZER("ppp", ppp_clone_create, ppp_clone_destroy); 211 212 #ifdef PPP_COMPRESS 213 ONCE_DECL(ppp_compressor_mtx_init); 214 static LIST_HEAD(, compressor) ppp_compressors = { NULL }; 215 static kmutex_t ppp_compressors_mtx; 216 217 static int ppp_compressor_init(void); 218 static struct compressor *ppp_get_compressor(uint8_t); 219 static void ppp_compressor_rele(struct compressor *); 220 #endif /* PPP_COMPRESS */ 221 222 223 /* 224 * Called from boot code to establish ppp interfaces. 225 */ 226 void 227 pppattach(void) 228 { 229 extern struct linesw ppp_disc; 230 231 if (ttyldisc_attach(&ppp_disc) != 0) 232 panic("pppattach"); 233 234 mutex_init(&ppp_list_lock, MUTEX_DEFAULT, IPL_NONE); 235 LIST_INIT(&ppp_softc_list); 236 if_clone_attach(&ppp_cloner); 237 RUN_ONCE(&ppp_compressor_mtx_init, ppp_compressor_init); 238 } 239 240 static struct ppp_softc * 241 ppp_create(const char *name, int unit) 242 { 243 struct ppp_softc *sc, *sci, *scl = NULL; 244 245 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAIT|M_ZERO); 246 247 mutex_enter(&ppp_list_lock); 248 if (unit == -1) { 249 int i = 0; 250 LIST_FOREACH(sci, &ppp_softc_list, sc_iflist) { 251 scl = sci; 252 if (i < sci->sc_unit) { 253 unit = i; 254 break; 255 } else { 256 #ifdef DIAGNOSTIC 257 KASSERT(i == sci->sc_unit); 258 #endif 259 i++; 260 } 261 } 262 if (unit == -1) 263 unit = i; 264 } else { 265 LIST_FOREACH(sci, &ppp_softc_list, sc_iflist) { 266 scl = sci; 267 if (unit < sci->sc_unit) 268 break; 269 else if (unit == sci->sc_unit) { 270 free(sc, M_DEVBUF); 271 return NULL; 272 } 273 } 274 } 275 276 if (sci != NULL) 277 LIST_INSERT_BEFORE(sci, sc, sc_iflist); 278 else if (scl != NULL) 279 LIST_INSERT_AFTER(scl, sc, sc_iflist); 280 else 281 LIST_INSERT_HEAD(&ppp_softc_list, sc, sc_iflist); 282 283 mutex_exit(&ppp_list_lock); 284 285 if_initname(&sc->sc_if, name, sc->sc_unit = unit); 286 callout_init(&sc->sc_timo_ch, 0); 287 sc->sc_if.if_softc = sc; 288 sc->sc_if.if_mtu = PPP_MTU; 289 sc->sc_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 290 sc->sc_if.if_type = IFT_PPP; 291 sc->sc_if.if_hdrlen = PPP_HDRLEN; 292 sc->sc_if.if_dlt = DLT_NULL; 293 sc->sc_if.if_ioctl = pppsioctl; 294 sc->sc_if.if_output = pppoutput; 295 #ifdef ALTQ 296 sc->sc_if.if_start = ppp_ifstart; 297 #endif 298 IFQ_SET_MAXLEN(&sc->sc_if.if_snd, IFQ_MAXLEN); 299 sc->sc_inq.ifq_maxlen = IFQ_MAXLEN; 300 sc->sc_fastq.ifq_maxlen = IFQ_MAXLEN; 301 sc->sc_rawq.ifq_maxlen = IFQ_MAXLEN; 302 /* Ratio of 1:2 packets between the regular and the fast queue */ 303 sc->sc_maxfastq = 2; 304 IFQ_SET_READY(&sc->sc_if.if_snd); 305 if_attach(&sc->sc_if); 306 if_alloc_sadl(&sc->sc_if); 307 bpf_attach(&sc->sc_if, DLT_NULL, 0); 308 return sc; 309 } 310 311 static int 312 ppp_clone_create(struct if_clone *ifc, int unit) 313 { 314 return ppp_create(ifc->ifc_name, unit) == NULL ? EEXIST : 0; 315 } 316 317 static int 318 ppp_clone_destroy(struct ifnet *ifp) 319 { 320 struct ppp_softc *sc = (struct ppp_softc *)ifp->if_softc; 321 322 if (sc->sc_devp != NULL) 323 return EBUSY; /* Not removing it */ 324 325 mutex_enter(&ppp_list_lock); 326 LIST_REMOVE(sc, sc_iflist); 327 mutex_exit(&ppp_list_lock); 328 329 bpf_detach(ifp); 330 if_detach(ifp); 331 332 free(sc, M_DEVBUF); 333 return 0; 334 } 335 336 /* 337 * Allocate a ppp interface unit and initialize it. 338 */ 339 struct ppp_softc * 340 pppalloc(pid_t pid) 341 { 342 struct ppp_softc *sc = NULL, *scf; 343 int i; 344 345 mutex_enter(&ppp_list_lock); 346 LIST_FOREACH(scf, &ppp_softc_list, sc_iflist) { 347 if (scf->sc_xfer == pid) { 348 scf->sc_xfer = 0; 349 mutex_exit(&ppp_list_lock); 350 return scf; 351 } 352 if (scf->sc_devp == NULL && sc == NULL) 353 sc = scf; 354 } 355 mutex_exit(&ppp_list_lock); 356 357 if (sc == NULL) 358 sc = ppp_create(ppp_cloner.ifc_name, -1); 359 360 sc->sc_si = softint_establish(SOFTINT_NET, pppintr, sc); 361 if (sc->sc_si == NULL) { 362 printf("%s: unable to establish softintr\n", sc->sc_if.if_xname); 363 return (NULL); 364 } 365 sc->sc_flags = 0; 366 sc->sc_mru = PPP_MRU; 367 sc->sc_relinq = NULL; 368 (void)memset(&sc->sc_stats, 0, sizeof(sc->sc_stats)); 369 #ifdef VJC 370 sc->sc_comp = malloc(sizeof(struct slcompress), M_DEVBUF, M_NOWAIT); 371 if (sc->sc_comp) 372 sl_compress_init(sc->sc_comp); 373 #endif 374 #ifdef PPP_COMPRESS 375 sc->sc_xc_state = NULL; 376 sc->sc_rc_state = NULL; 377 #endif /* PPP_COMPRESS */ 378 for (i = 0; i < NUM_NP; ++i) 379 sc->sc_npmode[i] = NPMODE_ERROR; 380 sc->sc_npqueue = NULL; 381 sc->sc_npqtail = &sc->sc_npqueue; 382 sc->sc_last_sent = sc->sc_last_recv = time_second; 383 384 return sc; 385 } 386 387 /* 388 * Deallocate a ppp unit. Must be called at splsoftnet or higher. 389 */ 390 void 391 pppdealloc(struct ppp_softc *sc) 392 { 393 struct mbuf *m; 394 395 softint_disestablish(sc->sc_si); 396 if_down(&sc->sc_if); 397 sc->sc_if.if_flags &= ~(IFF_UP|IFF_RUNNING); 398 sc->sc_devp = NULL; 399 sc->sc_xfer = 0; 400 for (;;) { 401 IF_DEQUEUE(&sc->sc_rawq, m); 402 if (m == NULL) 403 break; 404 m_freem(m); 405 } 406 for (;;) { 407 IF_DEQUEUE(&sc->sc_inq, m); 408 if (m == NULL) 409 break; 410 m_freem(m); 411 } 412 for (;;) { 413 IF_DEQUEUE(&sc->sc_fastq, m); 414 if (m == NULL) 415 break; 416 m_freem(m); 417 } 418 while ((m = sc->sc_npqueue) != NULL) { 419 sc->sc_npqueue = m->m_nextpkt; 420 m_freem(m); 421 } 422 if (sc->sc_togo != NULL) { 423 m_freem(sc->sc_togo); 424 sc->sc_togo = NULL; 425 } 426 #ifdef PPP_COMPRESS 427 ppp_ccp_closed(sc); 428 sc->sc_xc_state = NULL; 429 sc->sc_rc_state = NULL; 430 #endif /* PPP_COMPRESS */ 431 #ifdef PPP_FILTER 432 if (sc->sc_pass_filt_in.bf_insns != 0) { 433 free(sc->sc_pass_filt_in.bf_insns, M_DEVBUF); 434 sc->sc_pass_filt_in.bf_insns = 0; 435 sc->sc_pass_filt_in.bf_len = 0; 436 } 437 if (sc->sc_pass_filt_out.bf_insns != 0) { 438 free(sc->sc_pass_filt_out.bf_insns, M_DEVBUF); 439 sc->sc_pass_filt_out.bf_insns = 0; 440 sc->sc_pass_filt_out.bf_len = 0; 441 } 442 if (sc->sc_active_filt_in.bf_insns != 0) { 443 free(sc->sc_active_filt_in.bf_insns, M_DEVBUF); 444 sc->sc_active_filt_in.bf_insns = 0; 445 sc->sc_active_filt_in.bf_len = 0; 446 } 447 if (sc->sc_active_filt_out.bf_insns != 0) { 448 free(sc->sc_active_filt_out.bf_insns, M_DEVBUF); 449 sc->sc_active_filt_out.bf_insns = 0; 450 sc->sc_active_filt_out.bf_len = 0; 451 } 452 #endif /* PPP_FILTER */ 453 #ifdef VJC 454 if (sc->sc_comp != 0) { 455 free(sc->sc_comp, M_DEVBUF); 456 sc->sc_comp = 0; 457 } 458 #endif 459 (void)ppp_clone_destroy(&sc->sc_if); 460 } 461 462 /* 463 * Ioctl routine for generic ppp devices. 464 */ 465 int 466 pppioctl(struct ppp_softc *sc, u_long cmd, void *data, int flag, 467 struct lwp *l) 468 { 469 int s, error, flags, mru, npx; 470 u_int nb; 471 struct ppp_option_data *odp; 472 struct compressor *cp; 473 struct npioctl *npi; 474 time_t t; 475 #ifdef PPP_FILTER 476 struct bpf_program *bp, *nbp; 477 struct bpf_insn *newcode, *oldcode; 478 int newcodelen; 479 #endif /* PPP_FILTER */ 480 #ifdef PPP_COMPRESS 481 u_char ccp_option[CCP_MAX_OPTION_LENGTH]; 482 #endif 483 484 switch (cmd) { 485 case PPPIOCSFLAGS: 486 case PPPIOCSMRU: 487 case PPPIOCSMAXCID: 488 case PPPIOCSCOMPRESS: 489 case PPPIOCSNPMODE: 490 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 491 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, &sc->sc_if, KAUTH_ARG(cmd), 492 NULL) != 0) 493 return (EPERM); 494 break; 495 case PPPIOCXFERUNIT: 496 /* XXX: Why is this privileged?! */ 497 if (kauth_authorize_network(l->l_cred, KAUTH_NETWORK_INTERFACE, 498 KAUTH_REQ_NETWORK_INTERFACE_GETPRIV, &sc->sc_if, KAUTH_ARG(cmd), 499 NULL) != 0) 500 return (EPERM); 501 break; 502 default: 503 break; 504 } 505 506 switch (cmd) { 507 case FIONREAD: 508 *(int *)data = sc->sc_inq.ifq_len; 509 break; 510 511 case PPPIOCGUNIT: 512 *(int *)data = sc->sc_unit; 513 break; 514 515 case PPPIOCGFLAGS: 516 *(u_int *)data = sc->sc_flags; 517 break; 518 519 case PPPIOCGRAWIN: 520 { 521 struct ppp_rawin *rwin = (struct ppp_rawin *)data; 522 u_char c, q = 0; 523 524 for (c = sc->sc_rawin_start; c < sizeof(sc->sc_rawin.buf);) 525 rwin->buf[q++] = sc->sc_rawin.buf[c++]; 526 527 for (c = 0; c < sc->sc_rawin_start;) 528 rwin->buf[q++] = sc->sc_rawin.buf[c++]; 529 530 rwin->count = sc->sc_rawin.count; 531 } 532 break; 533 534 case PPPIOCSFLAGS: 535 flags = *(int *)data & SC_MASK; 536 s = splsoftnet(); 537 #ifdef PPP_COMPRESS 538 if (sc->sc_flags & SC_CCP_OPEN && !(flags & SC_CCP_OPEN)) 539 ppp_ccp_closed(sc); 540 #endif 541 splhigh(); /* XXX IMP ME HARDER */ 542 sc->sc_flags = (sc->sc_flags & ~SC_MASK) | flags; 543 splx(s); 544 break; 545 546 case PPPIOCSMRU: 547 mru = *(int *)data; 548 if (mru >= PPP_MINMRU && mru <= PPP_MAXMRU) 549 sc->sc_mru = mru; 550 break; 551 552 case PPPIOCGMRU: 553 *(int *)data = sc->sc_mru; 554 break; 555 556 #ifdef VJC 557 case PPPIOCSMAXCID: 558 if (sc->sc_comp) { 559 s = splsoftnet(); 560 sl_compress_setup(sc->sc_comp, *(int *)data); 561 splx(s); 562 } 563 break; 564 #endif 565 566 case PPPIOCXFERUNIT: 567 sc->sc_xfer = l->l_proc->p_pid; 568 break; 569 570 #ifdef PPP_COMPRESS 571 case PPPIOCSCOMPRESS: 572 odp = (struct ppp_option_data *) data; 573 nb = odp->length; 574 if (nb > sizeof(ccp_option)) 575 nb = sizeof(ccp_option); 576 if ((error = copyin(odp->ptr, ccp_option, nb)) != 0) 577 return (error); 578 if (ccp_option[1] < 2) /* preliminary check on the length byte */ 579 return (EINVAL); 580 cp = ppp_get_compressor(ccp_option[0]); 581 if (cp == NULL) { 582 if (sc->sc_flags & SC_DEBUG) 583 printf("%s: no compressor for [%x %x %x], %x\n", 584 sc->sc_if.if_xname, ccp_option[0], ccp_option[1], 585 ccp_option[2], nb); 586 return (EINVAL); /* no handler found */ 587 } 588 /* 589 * Found a handler for the protocol - try to allocate 590 * a compressor or decompressor. 591 */ 592 error = 0; 593 if (odp->transmit) { 594 s = splsoftnet(); 595 if (sc->sc_xc_state != NULL) { 596 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 597 ppp_compressor_rele(sc->sc_xcomp); 598 } 599 sc->sc_xcomp = cp; 600 sc->sc_xc_state = cp->comp_alloc(ccp_option, nb); 601 if (sc->sc_xc_state == NULL) { 602 if (sc->sc_flags & SC_DEBUG) 603 printf("%s: comp_alloc failed\n", 604 sc->sc_if.if_xname); 605 error = ENOBUFS; 606 } 607 splhigh(); /* XXX IMP ME HARDER */ 608 sc->sc_flags &= ~SC_COMP_RUN; 609 splx(s); 610 } else { 611 s = splsoftnet(); 612 if (sc->sc_rc_state != NULL) { 613 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 614 ppp_compressor_rele(sc->sc_rcomp); 615 } 616 sc->sc_rcomp = cp; 617 sc->sc_rc_state = cp->decomp_alloc(ccp_option, nb); 618 if (sc->sc_rc_state == NULL) { 619 if (sc->sc_flags & SC_DEBUG) 620 printf("%s: decomp_alloc failed\n", 621 sc->sc_if.if_xname); 622 error = ENOBUFS; 623 } 624 splhigh(); /* XXX IMP ME HARDER */ 625 sc->sc_flags &= ~SC_DECOMP_RUN; 626 splx(s); 627 } 628 return (error); 629 #endif /* PPP_COMPRESS */ 630 631 case PPPIOCGNPMODE: 632 case PPPIOCSNPMODE: 633 npi = (struct npioctl *) data; 634 switch (npi->protocol) { 635 case PPP_IP: 636 npx = NP_IP; 637 break; 638 case PPP_IPV6: 639 npx = NP_IPV6; 640 break; 641 default: 642 return EINVAL; 643 } 644 if (cmd == PPPIOCGNPMODE) { 645 npi->mode = sc->sc_npmode[npx]; 646 } else { 647 if (npi->mode != sc->sc_npmode[npx]) { 648 s = splnet(); 649 sc->sc_npmode[npx] = npi->mode; 650 if (npi->mode != NPMODE_QUEUE) { 651 ppp_requeue(sc); 652 ppp_restart(sc); 653 } 654 splx(s); 655 } 656 } 657 break; 658 659 case PPPIOCGIDLE: 660 s = splsoftnet(); 661 t = time_second; 662 ((struct ppp_idle *)data)->xmit_idle = t - sc->sc_last_sent; 663 ((struct ppp_idle *)data)->recv_idle = t - sc->sc_last_recv; 664 splx(s); 665 break; 666 667 #ifdef PPP_FILTER 668 case PPPIOCSPASS: 669 case PPPIOCSACTIVE: 670 /* These are no longer supported. */ 671 return EOPNOTSUPP; 672 673 case PPPIOCSIPASS: 674 case PPPIOCSOPASS: 675 case PPPIOCSIACTIVE: 676 case PPPIOCSOACTIVE: 677 nbp = (struct bpf_program *) data; 678 if ((unsigned) nbp->bf_len > BPF_MAXINSNS) 679 return EINVAL; 680 newcodelen = nbp->bf_len * sizeof(struct bpf_insn); 681 if (newcodelen != 0) { 682 newcode = malloc(newcodelen, M_DEVBUF, M_WAITOK); 683 /* WAITOK -- malloc() never fails. */ 684 if ((error = copyin((void *)nbp->bf_insns, (void *)newcode, 685 newcodelen)) != 0) { 686 free(newcode, M_DEVBUF); 687 return error; 688 } 689 if (!bpf_validate(newcode, nbp->bf_len)) { 690 free(newcode, M_DEVBUF); 691 return EINVAL; 692 } 693 } else 694 newcode = 0; 695 switch (cmd) { 696 case PPPIOCSIPASS: 697 bp = &sc->sc_pass_filt_in; 698 break; 699 700 case PPPIOCSOPASS: 701 bp = &sc->sc_pass_filt_out; 702 break; 703 704 case PPPIOCSIACTIVE: 705 bp = &sc->sc_active_filt_in; 706 break; 707 708 case PPPIOCSOACTIVE: 709 bp = &sc->sc_active_filt_out; 710 break; 711 default: 712 free(newcode, M_DEVBUF); 713 return (EPASSTHROUGH); 714 } 715 oldcode = bp->bf_insns; 716 s = splnet(); 717 bp->bf_len = nbp->bf_len; 718 bp->bf_insns = newcode; 719 splx(s); 720 if (oldcode != 0) 721 free(oldcode, M_DEVBUF); 722 break; 723 #endif /* PPP_FILTER */ 724 725 default: 726 return (EPASSTHROUGH); 727 } 728 return (0); 729 } 730 731 /* 732 * Process an ioctl request to the ppp network interface. 733 */ 734 static int 735 pppsioctl(struct ifnet *ifp, u_long cmd, void *data) 736 { 737 struct ppp_softc *sc = ifp->if_softc; 738 struct ifaddr *ifa = (struct ifaddr *)data; 739 struct ifreq *ifr = (struct ifreq *)data; 740 struct ppp_stats *psp; 741 #ifdef PPP_COMPRESS 742 struct ppp_comp_stats *pcp; 743 #endif 744 int s = splnet(), error = 0; 745 746 switch (cmd) { 747 case SIOCSIFFLAGS: 748 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 749 break; 750 if ((ifp->if_flags & IFF_RUNNING) == 0) 751 ifp->if_flags &= ~IFF_UP; 752 break; 753 754 case SIOCINITIFADDR: 755 switch (ifa->ifa_addr->sa_family) { 756 #ifdef INET 757 case AF_INET: 758 break; 759 #endif 760 #ifdef INET6 761 case AF_INET6: 762 break; 763 #endif 764 default: 765 error = EAFNOSUPPORT; 766 break; 767 } 768 break; 769 770 case SIOCADDMULTI: 771 case SIOCDELMULTI: 772 if (ifr == NULL) { 773 error = EAFNOSUPPORT; 774 break; 775 } 776 switch (ifreq_getaddr(cmd, ifr)->sa_family) { 777 #ifdef INET 778 case AF_INET: 779 break; 780 #endif 781 #ifdef INET6 782 case AF_INET6: 783 break; 784 #endif 785 default: 786 error = EAFNOSUPPORT; 787 break; 788 } 789 break; 790 791 case SIOCGPPPSTATS: 792 psp = &((struct ifpppstatsreq *) data)->stats; 793 memset(psp, 0, sizeof(*psp)); 794 psp->p = sc->sc_stats; 795 #if defined(VJC) && !defined(SL_NO_STATS) 796 if (sc->sc_comp) { 797 psp->vj.vjs_packets = sc->sc_comp->sls_packets; 798 psp->vj.vjs_compressed = sc->sc_comp->sls_compressed; 799 psp->vj.vjs_searches = sc->sc_comp->sls_searches; 800 psp->vj.vjs_misses = sc->sc_comp->sls_misses; 801 psp->vj.vjs_uncompressedin = sc->sc_comp->sls_uncompressedin; 802 psp->vj.vjs_compressedin = sc->sc_comp->sls_compressedin; 803 psp->vj.vjs_errorin = sc->sc_comp->sls_errorin; 804 psp->vj.vjs_tossed = sc->sc_comp->sls_tossed; 805 } 806 #endif /* VJC */ 807 break; 808 809 #ifdef PPP_COMPRESS 810 case SIOCGPPPCSTATS: 811 pcp = &((struct ifpppcstatsreq *) data)->stats; 812 memset(pcp, 0, sizeof(*pcp)); 813 if (sc->sc_xc_state != NULL) 814 (*sc->sc_xcomp->comp_stat)(sc->sc_xc_state, &pcp->c); 815 if (sc->sc_rc_state != NULL) 816 (*sc->sc_rcomp->decomp_stat)(sc->sc_rc_state, &pcp->d); 817 break; 818 #endif /* PPP_COMPRESS */ 819 820 default: 821 if ((error = ifioctl_common(&sc->sc_if, cmd, data)) == ENETRESET) 822 error = 0; 823 break; 824 } 825 splx(s); 826 return (error); 827 } 828 829 /* 830 * Queue a packet. Start transmission if not active. 831 * Packet is placed in Information field of PPP frame. 832 */ 833 int 834 pppoutput(struct ifnet *ifp, struct mbuf *m0, const struct sockaddr *dst, 835 struct rtentry *rtp) 836 { 837 struct ppp_softc *sc = ifp->if_softc; 838 int protocol, address, control; 839 u_char *cp; 840 int s, error; 841 #ifdef INET 842 struct ip *ip; 843 #endif 844 struct ifqueue *ifq; 845 enum NPmode mode; 846 int len; 847 ALTQ_DECL(struct altq_pktattr pktattr;) 848 849 if (sc->sc_devp == NULL || (ifp->if_flags & IFF_RUNNING) == 0 850 || ((ifp->if_flags & IFF_UP) == 0 && dst->sa_family != AF_UNSPEC)) { 851 error = ENETDOWN; /* sort of */ 852 goto bad; 853 } 854 855 IFQ_CLASSIFY(&ifp->if_snd, m0, dst->sa_family, &pktattr); 856 857 /* 858 * Compute PPP header. 859 */ 860 m0->m_flags &= ~M_HIGHPRI; 861 switch (dst->sa_family) { 862 #ifdef INET 863 case AF_INET: 864 address = PPP_ALLSTATIONS; 865 control = PPP_UI; 866 protocol = PPP_IP; 867 mode = sc->sc_npmode[NP_IP]; 868 869 /* 870 * If this packet has the "low delay" bit set in the IP header, 871 * put it on the fastq instead. 872 */ 873 ip = mtod(m0, struct ip *); 874 if (ip->ip_tos & IPTOS_LOWDELAY) 875 m0->m_flags |= M_HIGHPRI; 876 break; 877 #endif 878 #ifdef INET6 879 case AF_INET6: 880 address = PPP_ALLSTATIONS; /*XXX*/ 881 control = PPP_UI; /*XXX*/ 882 protocol = PPP_IPV6; 883 mode = sc->sc_npmode[NP_IPV6]; 884 885 #if 0 /* XXX flowinfo/traffic class, maybe? */ 886 /* 887 * If this packet has the "low delay" bit set in the IP header, 888 * put it on the fastq instead. 889 */ 890 ip = mtod(m0, struct ip *); 891 if (ip->ip_tos & IPTOS_LOWDELAY) 892 m0->m_flags |= M_HIGHPRI; 893 #endif 894 break; 895 #endif 896 case AF_UNSPEC: 897 address = PPP_ADDRESS(dst->sa_data); 898 control = PPP_CONTROL(dst->sa_data); 899 protocol = PPP_PROTOCOL(dst->sa_data); 900 mode = NPMODE_PASS; 901 break; 902 default: 903 printf("%s: af%d not supported\n", ifp->if_xname, dst->sa_family); 904 error = EAFNOSUPPORT; 905 goto bad; 906 } 907 908 /* 909 * Drop this packet, or return an error, if necessary. 910 */ 911 if (mode == NPMODE_ERROR) { 912 error = ENETDOWN; 913 goto bad; 914 } 915 if (mode == NPMODE_DROP) { 916 error = 0; 917 goto bad; 918 } 919 920 /* 921 * Add PPP header. 922 */ 923 M_PREPEND(m0, PPP_HDRLEN, M_DONTWAIT); 924 if (m0 == NULL) { 925 error = ENOBUFS; 926 goto bad; 927 } 928 929 cp = mtod(m0, u_char *); 930 *cp++ = address; 931 *cp++ = control; 932 *cp++ = protocol >> 8; 933 *cp++ = protocol & 0xff; 934 935 len = m_length(m0); 936 937 if (sc->sc_flags & SC_LOG_OUTPKT) { 938 printf("%s output: ", ifp->if_xname); 939 pppdumpm(m0); 940 } 941 942 if ((protocol & 0x8000) == 0) { 943 #ifdef PPP_FILTER 944 /* 945 * Apply the pass and active filters to the packet, 946 * but only if it is a data packet. 947 */ 948 if (sc->sc_pass_filt_out.bf_insns != 0 949 && bpf_filter(sc->sc_pass_filt_out.bf_insns, 950 (u_char *)m0, len, 0) == 0) { 951 error = 0; /* drop this packet */ 952 goto bad; 953 } 954 955 /* 956 * Update the time we sent the most recent packet. 957 */ 958 if (sc->sc_active_filt_out.bf_insns == 0 959 || bpf_filter(sc->sc_active_filt_out.bf_insns, 960 (u_char *)m0, len, 0)) 961 sc->sc_last_sent = time_second; 962 #else 963 /* 964 * Update the time we sent the most recent packet. 965 */ 966 sc->sc_last_sent = time_second; 967 #endif /* PPP_FILTER */ 968 } 969 970 /* 971 * See if bpf wants to look at the packet. 972 */ 973 bpf_mtap(&sc->sc_if, m0); 974 975 /* 976 * Put the packet on the appropriate queue. 977 */ 978 s = splnet(); 979 if (mode == NPMODE_QUEUE) { 980 /* XXX we should limit the number of packets on this queue */ 981 *sc->sc_npqtail = m0; 982 m0->m_nextpkt = NULL; 983 sc->sc_npqtail = &m0->m_nextpkt; 984 } else { 985 ifq = (m0->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 986 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m0 987 ALTQ_COMMA ALTQ_DECL(&pktattr))) != 0) { 988 splx(s); 989 sc->sc_if.if_oerrors++; 990 sc->sc_stats.ppp_oerrors++; 991 return (error); 992 } 993 ppp_restart(sc); 994 } 995 ifp->if_opackets++; 996 ifp->if_obytes += len; 997 998 splx(s); 999 return (0); 1000 1001 bad: 1002 m_freem(m0); 1003 return (error); 1004 } 1005 1006 /* 1007 * After a change in the NPmode for some NP, move packets from the 1008 * npqueue to the send queue or the fast queue as appropriate. 1009 * Should be called at splnet, since we muck with the queues. 1010 */ 1011 static void 1012 ppp_requeue(struct ppp_softc *sc) 1013 { 1014 struct mbuf *m, **mpp; 1015 struct ifqueue *ifq; 1016 enum NPmode mode; 1017 int error; 1018 1019 for (mpp = &sc->sc_npqueue; (m = *mpp) != NULL; ) { 1020 switch (PPP_PROTOCOL(mtod(m, u_char *))) { 1021 case PPP_IP: 1022 mode = sc->sc_npmode[NP_IP]; 1023 break; 1024 case PPP_IPV6: 1025 mode = sc->sc_npmode[NP_IPV6]; 1026 break; 1027 default: 1028 mode = NPMODE_PASS; 1029 } 1030 1031 switch (mode) { 1032 case NPMODE_PASS: 1033 /* 1034 * This packet can now go on one of the queues to be sent. 1035 */ 1036 *mpp = m->m_nextpkt; 1037 m->m_nextpkt = NULL; 1038 ifq = (m->m_flags & M_HIGHPRI) ? &sc->sc_fastq : NULL; 1039 if ((error = ifq_enqueue2(&sc->sc_if, ifq, m ALTQ_COMMA 1040 ALTQ_DECL(NULL))) != 0) { 1041 sc->sc_if.if_oerrors++; 1042 sc->sc_stats.ppp_oerrors++; 1043 } 1044 break; 1045 1046 case NPMODE_DROP: 1047 case NPMODE_ERROR: 1048 *mpp = m->m_nextpkt; 1049 m_freem(m); 1050 break; 1051 1052 case NPMODE_QUEUE: 1053 mpp = &m->m_nextpkt; 1054 break; 1055 } 1056 } 1057 sc->sc_npqtail = mpp; 1058 } 1059 1060 /* 1061 * Transmitter has finished outputting some stuff; 1062 * remember to call sc->sc_start later at splsoftnet. 1063 */ 1064 void 1065 ppp_restart(struct ppp_softc *sc) 1066 { 1067 int s = splhigh(); /* XXX IMP ME HARDER */ 1068 1069 sc->sc_flags &= ~SC_TBUSY; 1070 softint_schedule(sc->sc_si); 1071 splx(s); 1072 } 1073 1074 /* 1075 * Get a packet to send. This procedure is intended to be called at 1076 * splsoftnet, since it may involve time-consuming operations such as 1077 * applying VJ compression, packet compression, address/control and/or 1078 * protocol field compression to the packet. 1079 */ 1080 struct mbuf * 1081 ppp_dequeue(struct ppp_softc *sc) 1082 { 1083 struct mbuf *m, *mp; 1084 u_char *cp; 1085 int address, control, protocol; 1086 int s; 1087 1088 /* 1089 * Grab a packet to send: first try the fast queue, then the 1090 * normal queue. 1091 */ 1092 s = splnet(); 1093 if (sc->sc_nfastq < sc->sc_maxfastq) { 1094 IF_DEQUEUE(&sc->sc_fastq, m); 1095 if (m != NULL) 1096 sc->sc_nfastq++; 1097 else 1098 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1099 } else { 1100 sc->sc_nfastq = 0; 1101 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 1102 if (m == NULL) { 1103 IF_DEQUEUE(&sc->sc_fastq, m); 1104 if (m != NULL) 1105 sc->sc_nfastq++; 1106 } 1107 } 1108 splx(s); 1109 1110 if (m == NULL) 1111 return NULL; 1112 1113 ++sc->sc_stats.ppp_opackets; 1114 1115 /* 1116 * Extract the ppp header of the new packet. 1117 * The ppp header will be in one mbuf. 1118 */ 1119 cp = mtod(m, u_char *); 1120 address = PPP_ADDRESS(cp); 1121 control = PPP_CONTROL(cp); 1122 protocol = PPP_PROTOCOL(cp); 1123 1124 switch (protocol) { 1125 case PPP_IP: 1126 #ifdef VJC 1127 /* 1128 * If the packet is a TCP/IP packet, see if we can compress it. 1129 */ 1130 if ((sc->sc_flags & SC_COMP_TCP) && sc->sc_comp != NULL) { 1131 struct ip *ip; 1132 int type; 1133 1134 mp = m; 1135 ip = (struct ip *) (cp + PPP_HDRLEN); 1136 if (mp->m_len <= PPP_HDRLEN) { 1137 mp = mp->m_next; 1138 if (mp == NULL) 1139 break; 1140 ip = mtod(mp, struct ip *); 1141 } 1142 /* this code assumes the IP/TCP header is in one non-shared mbuf */ 1143 if (ip->ip_p == IPPROTO_TCP) { 1144 type = sl_compress_tcp(mp, ip, sc->sc_comp, 1145 !(sc->sc_flags & SC_NO_TCP_CCID)); 1146 switch (type) { 1147 case TYPE_UNCOMPRESSED_TCP: 1148 protocol = PPP_VJC_UNCOMP; 1149 break; 1150 case TYPE_COMPRESSED_TCP: 1151 protocol = PPP_VJC_COMP; 1152 cp = mtod(m, u_char *); 1153 cp[0] = address; /* header has moved */ 1154 cp[1] = control; 1155 cp[2] = 0; 1156 break; 1157 } 1158 cp[3] = protocol; /* update protocol in PPP header */ 1159 } 1160 } 1161 #endif /* VJC */ 1162 break; 1163 1164 #ifdef PPP_COMPRESS 1165 case PPP_CCP: 1166 ppp_ccp(sc, m, 0); 1167 break; 1168 #endif /* PPP_COMPRESS */ 1169 } 1170 1171 #ifdef PPP_COMPRESS 1172 if (protocol != PPP_LCP && protocol != PPP_CCP 1173 && sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) { 1174 struct mbuf *mcomp = NULL; 1175 int slen; 1176 1177 slen = 0; 1178 for (mp = m; mp != NULL; mp = mp->m_next) 1179 slen += mp->m_len; 1180 (*sc->sc_xcomp->compress) 1181 (sc->sc_xc_state, &mcomp, m, slen, sc->sc_if.if_mtu + PPP_HDRLEN); 1182 if (mcomp != NULL) { 1183 if (sc->sc_flags & SC_CCP_UP) { 1184 /* Send the compressed packet instead of the original. */ 1185 m_freem(m); 1186 m = mcomp; 1187 cp = mtod(m, u_char *); 1188 protocol = cp[3]; 1189 } else { 1190 /* Can't transmit compressed packets until CCP is up. */ 1191 m_freem(mcomp); 1192 } 1193 } 1194 } 1195 #endif /* PPP_COMPRESS */ 1196 1197 /* 1198 * Compress the address/control and protocol, if possible. 1199 */ 1200 if (sc->sc_flags & SC_COMP_AC && address == PPP_ALLSTATIONS && 1201 control == PPP_UI && protocol != PPP_ALLSTATIONS && 1202 protocol != PPP_LCP) { 1203 /* can compress address/control */ 1204 m->m_data += 2; 1205 m->m_len -= 2; 1206 } 1207 if (sc->sc_flags & SC_COMP_PROT && protocol < 0xFF) { 1208 /* can compress protocol */ 1209 if (mtod(m, u_char *) == cp) { 1210 cp[2] = cp[1]; /* move address/control up */ 1211 cp[1] = cp[0]; 1212 } 1213 ++m->m_data; 1214 --m->m_len; 1215 } 1216 1217 return m; 1218 } 1219 1220 /* 1221 * Software interrupt routine, called at splsoftnet. 1222 */ 1223 static void 1224 pppintr(void *arg) 1225 { 1226 struct ppp_softc *sc = arg; 1227 struct mbuf *m; 1228 int s; 1229 1230 mutex_enter(softnet_lock); 1231 if (!(sc->sc_flags & SC_TBUSY) 1232 && (IFQ_IS_EMPTY(&sc->sc_if.if_snd) == 0 || sc->sc_fastq.ifq_head 1233 || sc->sc_outm)) { 1234 s = splhigh(); /* XXX IMP ME HARDER */ 1235 sc->sc_flags |= SC_TBUSY; 1236 splx(s); 1237 (*sc->sc_start)(sc); 1238 } 1239 for (;;) { 1240 s = splnet(); 1241 IF_DEQUEUE(&sc->sc_rawq, m); 1242 splx(s); 1243 if (m == NULL) 1244 break; 1245 ppp_inproc(sc, m); 1246 } 1247 mutex_exit(softnet_lock); 1248 } 1249 1250 #ifdef PPP_COMPRESS 1251 /* 1252 * Handle a CCP packet. `rcvd' is 1 if the packet was received, 1253 * 0 if it is about to be transmitted. 1254 */ 1255 static void 1256 ppp_ccp(struct ppp_softc *sc, struct mbuf *m, int rcvd) 1257 { 1258 u_char *dp, *ep; 1259 struct mbuf *mp; 1260 int slen, s; 1261 1262 /* 1263 * Get a pointer to the data after the PPP header. 1264 */ 1265 if (m->m_len <= PPP_HDRLEN) { 1266 mp = m->m_next; 1267 if (mp == NULL) 1268 return; 1269 dp = mtod(mp, u_char *); 1270 } else { 1271 mp = m; 1272 dp = mtod(mp, u_char *) + PPP_HDRLEN; 1273 } 1274 1275 ep = mtod(mp, u_char *) + mp->m_len; 1276 if (dp + CCP_HDRLEN > ep) 1277 return; 1278 slen = CCP_LENGTH(dp); 1279 if (dp + slen > ep) { 1280 if (sc->sc_flags & SC_DEBUG) 1281 printf("if_ppp/ccp: not enough data in mbuf (%p+%x > %p+%x)\n", 1282 dp, slen, mtod(mp, u_char *), mp->m_len); 1283 return; 1284 } 1285 1286 switch (CCP_CODE(dp)) { 1287 case CCP_CONFREQ: 1288 case CCP_TERMREQ: 1289 case CCP_TERMACK: 1290 /* CCP must be going down - disable compression */ 1291 if (sc->sc_flags & SC_CCP_UP) { 1292 s = splhigh(); /* XXX IMP ME HARDER */ 1293 sc->sc_flags &= ~(SC_CCP_UP | SC_COMP_RUN | SC_DECOMP_RUN); 1294 splx(s); 1295 } 1296 break; 1297 1298 case CCP_CONFACK: 1299 if (sc->sc_flags & SC_CCP_OPEN && !(sc->sc_flags & SC_CCP_UP) 1300 && slen >= CCP_HDRLEN + CCP_OPT_MINLEN 1301 && slen >= CCP_OPT_LENGTH(dp + CCP_HDRLEN) + CCP_HDRLEN) { 1302 if (!rcvd) { 1303 /* we're agreeing to send compressed packets. */ 1304 if (sc->sc_xc_state != NULL 1305 && (*sc->sc_xcomp->comp_init) 1306 (sc->sc_xc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1307 sc->sc_unit, 0, sc->sc_flags & SC_DEBUG)) { 1308 s = splhigh(); /* XXX IMP ME HARDER */ 1309 sc->sc_flags |= SC_COMP_RUN; 1310 splx(s); 1311 } 1312 } else { 1313 /* peer is agreeing to send compressed packets. */ 1314 if (sc->sc_rc_state != NULL 1315 && (*sc->sc_rcomp->decomp_init) 1316 (sc->sc_rc_state, dp + CCP_HDRLEN, slen - CCP_HDRLEN, 1317 sc->sc_unit, 0, sc->sc_mru, 1318 sc->sc_flags & SC_DEBUG)) { 1319 s = splhigh(); /* XXX IMP ME HARDER */ 1320 sc->sc_flags |= SC_DECOMP_RUN; 1321 sc->sc_flags &= ~(SC_DC_ERROR | SC_DC_FERROR); 1322 splx(s); 1323 } 1324 } 1325 } 1326 break; 1327 1328 case CCP_RESETACK: 1329 if (sc->sc_flags & SC_CCP_UP) { 1330 if (!rcvd) { 1331 if (sc->sc_xc_state && (sc->sc_flags & SC_COMP_RUN)) 1332 (*sc->sc_xcomp->comp_reset)(sc->sc_xc_state); 1333 } else { 1334 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1335 (*sc->sc_rcomp->decomp_reset)(sc->sc_rc_state); 1336 s = splhigh(); /* XXX IMP ME HARDER */ 1337 sc->sc_flags &= ~SC_DC_ERROR; 1338 splx(s); 1339 } 1340 } 1341 } 1342 break; 1343 } 1344 } 1345 1346 /* 1347 * CCP is down; free (de)compressor state if necessary. 1348 */ 1349 static void 1350 ppp_ccp_closed(struct ppp_softc *sc) 1351 { 1352 if (sc->sc_xc_state) { 1353 (*sc->sc_xcomp->comp_free)(sc->sc_xc_state); 1354 ppp_compressor_rele(sc->sc_xcomp); 1355 sc->sc_xc_state = NULL; 1356 } 1357 if (sc->sc_rc_state) { 1358 (*sc->sc_rcomp->decomp_free)(sc->sc_rc_state); 1359 ppp_compressor_rele(sc->sc_rcomp); 1360 sc->sc_rc_state = NULL; 1361 } 1362 } 1363 #endif /* PPP_COMPRESS */ 1364 1365 /* 1366 * PPP packet input routine. 1367 * The caller has checked and removed the FCS and has inserted 1368 * the address/control bytes and the protocol high byte if they 1369 * were omitted. 1370 */ 1371 void 1372 ppppktin(struct ppp_softc *sc, struct mbuf *m, int lost) 1373 { 1374 int s = splhigh(); /* XXX IMP ME HARDER */ 1375 1376 if (lost) 1377 m->m_flags |= M_ERRMARK; 1378 IF_ENQUEUE(&sc->sc_rawq, m); 1379 softint_schedule(sc->sc_si); 1380 splx(s); 1381 } 1382 1383 /* 1384 * Process a received PPP packet, doing decompression as necessary. 1385 * Should be called at splsoftnet. 1386 */ 1387 #define COMPTYPE(proto) ((proto) == PPP_VJC_COMP? TYPE_COMPRESSED_TCP: \ 1388 TYPE_UNCOMPRESSED_TCP) 1389 1390 static void 1391 ppp_inproc(struct ppp_softc *sc, struct mbuf *m) 1392 { 1393 struct ifnet *ifp = &sc->sc_if; 1394 struct ifqueue *inq; 1395 int s, ilen, proto, rv; 1396 u_char *cp, adrs, ctrl; 1397 struct mbuf *mp, *dmp = NULL; 1398 #ifdef VJC 1399 int xlen; 1400 u_char *iphdr; 1401 u_int hlen; 1402 #endif 1403 1404 sc->sc_stats.ppp_ipackets++; 1405 1406 if (sc->sc_flags & SC_LOG_INPKT) { 1407 ilen = 0; 1408 for (mp = m; mp != NULL; mp = mp->m_next) 1409 ilen += mp->m_len; 1410 printf("%s: got %d bytes\n", ifp->if_xname, ilen); 1411 pppdumpm(m); 1412 } 1413 1414 cp = mtod(m, u_char *); 1415 adrs = PPP_ADDRESS(cp); 1416 ctrl = PPP_CONTROL(cp); 1417 proto = PPP_PROTOCOL(cp); 1418 1419 if (m->m_flags & M_ERRMARK) { 1420 m->m_flags &= ~M_ERRMARK; 1421 s = splhigh(); /* XXX IMP ME HARDER */ 1422 sc->sc_flags |= SC_VJ_RESET; 1423 splx(s); 1424 } 1425 1426 #ifdef PPP_COMPRESS 1427 /* 1428 * Decompress this packet if necessary, update the receiver's 1429 * dictionary, or take appropriate action on a CCP packet. 1430 */ 1431 if (proto == PPP_COMP && sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN) 1432 && !(sc->sc_flags & SC_DC_ERROR) && !(sc->sc_flags & SC_DC_FERROR)) { 1433 /* decompress this packet */ 1434 rv = (*sc->sc_rcomp->decompress)(sc->sc_rc_state, m, &dmp); 1435 if (rv == DECOMP_OK) { 1436 m_freem(m); 1437 if (dmp == NULL) { 1438 /* no error, but no decompressed packet produced */ 1439 return; 1440 } 1441 m = dmp; 1442 cp = mtod(m, u_char *); 1443 proto = PPP_PROTOCOL(cp); 1444 1445 } else { 1446 /* 1447 * An error has occurred in decompression. 1448 * Pass the compressed packet up to pppd, which may take 1449 * CCP down or issue a Reset-Req. 1450 */ 1451 if (sc->sc_flags & SC_DEBUG) 1452 printf("%s: decompress failed %d\n", ifp->if_xname, rv); 1453 s = splhigh(); /* XXX IMP ME HARDER */ 1454 sc->sc_flags |= SC_VJ_RESET; 1455 if (rv == DECOMP_ERROR) 1456 sc->sc_flags |= SC_DC_ERROR; 1457 else 1458 sc->sc_flags |= SC_DC_FERROR; 1459 splx(s); 1460 } 1461 1462 } else { 1463 if (sc->sc_rc_state && (sc->sc_flags & SC_DECOMP_RUN)) { 1464 (*sc->sc_rcomp->incomp)(sc->sc_rc_state, m); 1465 } 1466 if (proto == PPP_CCP) { 1467 ppp_ccp(sc, m, 1); 1468 } 1469 } 1470 #endif 1471 1472 ilen = 0; 1473 for (mp = m; mp != NULL; mp = mp->m_next) 1474 ilen += mp->m_len; 1475 1476 #ifdef VJC 1477 if (sc->sc_flags & SC_VJ_RESET) { 1478 /* 1479 * If we've missed a packet, we must toss subsequent compressed 1480 * packets which don't have an explicit connection ID. 1481 */ 1482 if (sc->sc_comp) 1483 sl_uncompress_tcp(NULL, 0, TYPE_ERROR, sc->sc_comp); 1484 s = splhigh(); /* XXX IMP ME HARDER */ 1485 sc->sc_flags &= ~SC_VJ_RESET; 1486 splx(s); 1487 } 1488 1489 /* 1490 * See if we have a VJ-compressed packet to uncompress. 1491 */ 1492 if (proto == PPP_VJC_COMP) { 1493 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1494 goto bad; 1495 1496 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1497 ilen - PPP_HDRLEN, TYPE_COMPRESSED_TCP, 1498 sc->sc_comp, &iphdr, &hlen); 1499 1500 if (xlen <= 0) { 1501 if (sc->sc_flags & SC_DEBUG) 1502 printf("%s: VJ uncompress failed on type comp\n", 1503 ifp->if_xname); 1504 goto bad; 1505 } 1506 1507 /* Copy the PPP and IP headers into a new mbuf. */ 1508 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1509 if (mp == NULL) 1510 goto bad; 1511 mp->m_len = 0; 1512 mp->m_next = NULL; 1513 if (hlen + PPP_HDRLEN > MHLEN) { 1514 MCLGET(mp, M_DONTWAIT); 1515 if (M_TRAILINGSPACE(mp) < hlen + PPP_HDRLEN) { 1516 m_freem(mp); 1517 goto bad; /* lose if big headers and no clusters */ 1518 } 1519 } 1520 cp = mtod(mp, u_char *); 1521 cp[0] = adrs; 1522 cp[1] = ctrl; 1523 cp[2] = 0; 1524 cp[3] = PPP_IP; 1525 proto = PPP_IP; 1526 bcopy(iphdr, cp + PPP_HDRLEN, hlen); 1527 mp->m_len = hlen + PPP_HDRLEN; 1528 1529 /* 1530 * Trim the PPP and VJ headers off the old mbuf 1531 * and stick the new and old mbufs together. 1532 */ 1533 m->m_data += PPP_HDRLEN + xlen; 1534 m->m_len -= PPP_HDRLEN + xlen; 1535 if (m->m_len <= M_TRAILINGSPACE(mp)) { 1536 bcopy(mtod(m, u_char *), mtod(mp, u_char *) + mp->m_len, m->m_len); 1537 mp->m_len += m->m_len; 1538 MFREE(m, mp->m_next); 1539 } else 1540 mp->m_next = m; 1541 m = mp; 1542 ilen += hlen - xlen; 1543 1544 } else if (proto == PPP_VJC_UNCOMP) { 1545 if ((sc->sc_flags & SC_REJ_COMP_TCP) || sc->sc_comp == 0) 1546 goto bad; 1547 1548 xlen = sl_uncompress_tcp_core(cp + PPP_HDRLEN, m->m_len - PPP_HDRLEN, 1549 ilen - PPP_HDRLEN, TYPE_UNCOMPRESSED_TCP, 1550 sc->sc_comp, &iphdr, &hlen); 1551 1552 if (xlen < 0) { 1553 if (sc->sc_flags & SC_DEBUG) 1554 printf("%s: VJ uncompress failed on type uncomp\n", 1555 ifp->if_xname); 1556 goto bad; 1557 } 1558 1559 proto = PPP_IP; 1560 cp[3] = PPP_IP; 1561 } 1562 #endif /* VJC */ 1563 1564 /* 1565 * If the packet will fit in a header mbuf, don't waste a 1566 * whole cluster on it. 1567 */ 1568 if (ilen <= MHLEN && M_IS_CLUSTER(m)) { 1569 MGETHDR(mp, M_DONTWAIT, MT_DATA); 1570 if (mp != NULL) { 1571 m_copydata(m, 0, ilen, mtod(mp, void *)); 1572 m_freem(m); 1573 m = mp; 1574 m->m_len = ilen; 1575 } 1576 } 1577 m->m_pkthdr.len = ilen; 1578 m->m_pkthdr.rcvif = ifp; 1579 1580 if ((proto & 0x8000) == 0) { 1581 #ifdef PPP_FILTER 1582 /* 1583 * See whether we want to pass this packet, and 1584 * if it counts as link activity. 1585 */ 1586 if (sc->sc_pass_filt_in.bf_insns != 0 1587 && bpf_filter(sc->sc_pass_filt_in.bf_insns, 1588 (u_char *)m, ilen, 0) == 0) { 1589 /* drop this packet */ 1590 m_freem(m); 1591 return; 1592 } 1593 if (sc->sc_active_filt_in.bf_insns == 0 1594 || bpf_filter(sc->sc_active_filt_in.bf_insns, 1595 (u_char *)m, ilen, 0)) 1596 sc->sc_last_recv = time_second; 1597 #else 1598 /* 1599 * Record the time that we received this packet. 1600 */ 1601 sc->sc_last_recv = time_second; 1602 #endif /* PPP_FILTER */ 1603 } 1604 1605 /* See if bpf wants to look at the packet. */ 1606 bpf_mtap(&sc->sc_if, m); 1607 1608 rv = 0; 1609 switch (proto) { 1610 #ifdef INET 1611 case PPP_IP: 1612 /* 1613 * IP packet - take off the ppp header and pass it up to IP. 1614 */ 1615 if ((ifp->if_flags & IFF_UP) == 0 1616 || sc->sc_npmode[NP_IP] != NPMODE_PASS) { 1617 /* interface is down - drop the packet. */ 1618 m_freem(m); 1619 return; 1620 } 1621 m->m_pkthdr.len -= PPP_HDRLEN; 1622 m->m_data += PPP_HDRLEN; 1623 m->m_len -= PPP_HDRLEN; 1624 #ifdef GATEWAY 1625 if (ipflow_fastforward(m)) 1626 return; 1627 #endif 1628 schednetisr(NETISR_IP); 1629 inq = &ipintrq; 1630 break; 1631 #endif 1632 1633 #ifdef INET6 1634 case PPP_IPV6: 1635 /* 1636 * IPv6 packet - take off the ppp header and pass it up to IPv6. 1637 */ 1638 if ((ifp->if_flags & IFF_UP) == 0 1639 || sc->sc_npmode[NP_IPV6] != NPMODE_PASS) { 1640 /* interface is down - drop the packet. */ 1641 m_freem(m); 1642 return; 1643 } 1644 m->m_pkthdr.len -= PPP_HDRLEN; 1645 m->m_data += PPP_HDRLEN; 1646 m->m_len -= PPP_HDRLEN; 1647 #ifdef GATEWAY 1648 if (ip6flow_fastforward(&m)) 1649 return; 1650 #endif 1651 schednetisr(NETISR_IPV6); 1652 inq = &ip6intrq; 1653 break; 1654 #endif 1655 1656 default: 1657 /* 1658 * Some other protocol - place on input queue for read(). 1659 */ 1660 inq = &sc->sc_inq; 1661 rv = 1; 1662 break; 1663 } 1664 1665 /* 1666 * Put the packet on the appropriate input queue. 1667 */ 1668 s = splnet(); 1669 if (IF_QFULL(inq)) { 1670 IF_DROP(inq); 1671 splx(s); 1672 if (sc->sc_flags & SC_DEBUG) 1673 printf("%s: input queue full\n", ifp->if_xname); 1674 ifp->if_iqdrops++; 1675 goto bad; 1676 } 1677 IF_ENQUEUE(inq, m); 1678 splx(s); 1679 ifp->if_ipackets++; 1680 ifp->if_ibytes += ilen; 1681 1682 if (rv) 1683 (*sc->sc_ctlp)(sc); 1684 1685 return; 1686 1687 bad: 1688 m_freem(m); 1689 sc->sc_if.if_ierrors++; 1690 sc->sc_stats.ppp_ierrors++; 1691 } 1692 1693 #define MAX_DUMP_BYTES 128 1694 1695 static void 1696 pppdumpm(struct mbuf *m0) 1697 { 1698 char buf[3*MAX_DUMP_BYTES+4]; 1699 char *bp = buf; 1700 struct mbuf *m; 1701 1702 for (m = m0; m; m = m->m_next) { 1703 int l = m->m_len; 1704 u_char *rptr = (u_char *)m->m_data; 1705 1706 while (l--) { 1707 if (bp > buf + sizeof(buf) - 4) 1708 goto done; 1709 *bp++ = hexdigits[*rptr >> 4]; /* convert byte to ascii hex */ 1710 *bp++ = hexdigits[*rptr++ & 0xf]; 1711 } 1712 1713 if (m->m_next) { 1714 if (bp > buf + sizeof(buf) - 3) 1715 goto done; 1716 *bp++ = '|'; 1717 } else 1718 *bp++ = ' '; 1719 } 1720 done: 1721 if (m) 1722 *bp++ = '>'; 1723 *bp = 0; 1724 printf("%s\n", buf); 1725 } 1726 1727 #ifdef ALTQ 1728 /* 1729 * a wrapper to transmit a packet from if_start since ALTQ uses 1730 * if_start to send a packet. 1731 */ 1732 static void 1733 ppp_ifstart(struct ifnet *ifp) 1734 { 1735 struct ppp_softc *sc; 1736 1737 sc = ifp->if_softc; 1738 (*sc->sc_start)(sc); 1739 } 1740 #endif 1741 1742 static const struct ppp_known_compressor { 1743 uint8_t code; 1744 const char *module; 1745 } ppp_known_compressors[] = { 1746 { CI_DEFLATE, "ppp_deflate" }, 1747 { CI_DEFLATE_DRAFT, "ppp_deflate" }, 1748 { CI_BSD_COMPRESS, "ppp_bsdcomp" }, 1749 { CI_MPPE, "ppp_mppe" }, 1750 { 0, NULL } 1751 }; 1752 1753 static int 1754 ppp_compressor_init(void) 1755 { 1756 1757 mutex_init(&ppp_compressors_mtx, MUTEX_DEFAULT, IPL_NONE); 1758 return 0; 1759 } 1760 1761 static void 1762 ppp_compressor_rele(struct compressor *cp) 1763 { 1764 1765 mutex_enter(&ppp_compressors_mtx); 1766 --cp->comp_refcnt; 1767 mutex_exit(&ppp_compressors_mtx); 1768 } 1769 1770 static struct compressor * 1771 ppp_get_compressor_noload(uint8_t ci, bool hold) 1772 { 1773 struct compressor *cp; 1774 1775 KASSERT(mutex_owned(&ppp_compressors_mtx)); 1776 LIST_FOREACH(cp, &ppp_compressors, comp_list) { 1777 if (cp->compress_proto == ci) { 1778 if (hold) 1779 ++cp->comp_refcnt; 1780 return cp; 1781 } 1782 } 1783 1784 return NULL; 1785 } 1786 1787 static struct compressor * 1788 ppp_get_compressor(uint8_t ci) 1789 { 1790 struct compressor *cp = NULL; 1791 const struct ppp_known_compressor *pkc; 1792 1793 mutex_enter(&ppp_compressors_mtx); 1794 cp = ppp_get_compressor_noload(ci, true); 1795 mutex_exit(&ppp_compressors_mtx); 1796 if (cp != NULL) 1797 return cp; 1798 1799 kernconfig_lock(); 1800 mutex_enter(&ppp_compressors_mtx); 1801 cp = ppp_get_compressor_noload(ci, true); 1802 mutex_exit(&ppp_compressors_mtx); 1803 if (cp == NULL) { 1804 /* Not found, so try to autoload a module */ 1805 for (pkc = ppp_known_compressors; pkc->module != NULL; pkc++) { 1806 if (pkc->code == ci) { 1807 if (module_autoload(pkc->module, 1808 MODULE_CLASS_MISC) != 0) 1809 break; 1810 mutex_enter(&ppp_compressors_mtx); 1811 cp = ppp_get_compressor_noload(ci, true); 1812 mutex_exit(&ppp_compressors_mtx); 1813 break; 1814 } 1815 } 1816 } 1817 kernconfig_unlock(); 1818 1819 return cp; 1820 } 1821 1822 int 1823 ppp_register_compressor(struct compressor *pc, size_t ncomp) 1824 { 1825 int error = 0; 1826 size_t i; 1827 1828 RUN_ONCE(&ppp_compressor_mtx_init, ppp_compressor_init); 1829 1830 mutex_enter(&ppp_compressors_mtx); 1831 for (i = 0; i < ncomp; i++) { 1832 if (ppp_get_compressor_noload(pc[i].compress_proto, 1833 false) != NULL) 1834 error = EEXIST; 1835 } 1836 if (!error) { 1837 for (i = 0; i < ncomp; i++) { 1838 pc[i].comp_refcnt = 0; 1839 LIST_INSERT_HEAD(&ppp_compressors, &pc[i], comp_list); 1840 } 1841 } 1842 mutex_exit(&ppp_compressors_mtx); 1843 1844 return error; 1845 } 1846 1847 int 1848 ppp_unregister_compressor(struct compressor *pc, size_t ncomp) 1849 { 1850 int error = 0; 1851 size_t i; 1852 1853 mutex_enter(&ppp_compressors_mtx); 1854 for (i = 0; i < ncomp; i++) { 1855 if (ppp_get_compressor_noload(pc[i].compress_proto, 1856 false) != &pc[i]) 1857 error = ENOENT; 1858 else if (pc[i].comp_refcnt != 0) 1859 error = EBUSY; 1860 } 1861 if (!error) { 1862 for (i = 0; i < ncomp; i++) { 1863 LIST_REMOVE(&pc[i], comp_list); 1864 } 1865 } 1866 mutex_exit(&ppp_compressors_mtx); 1867 1868 return error; 1869 } 1870